Water supply system

ABSTRACT

A water supply system for delivering water from a water inlet manifold to a water outlet manifold, comprises a first water inlet pipe, an air pressure water tank and a first water pump; the first water inlet pipe is connected to the water inlet manifold; the air pressure water tank is connected between the first water inlet pipe and a water suction pipe of the first water pump; a water outlet pipe of the first water pump is connected to the water outlet manifold; the air pressure water tank is provided with a preset first water level; and the quantity of gas compressed in the air pressure water tank allows a pressure inside the air pressure water tank to be an atmospheric pressure when water in the air pressure water tank is in the first water level.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Patent Application No. PCT/CN2017/000235 with a filing date of Mar. 17, 2017, designating the United States, now pending, and further claims priority to Chinese Patent Application No. 201610167576.6 with a filing date of Mar. 18, 2016. The content of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference.

TECHNICAL FIELD

The disclosure relates to the technical field of water supply, and particularly relates to a water supply system.

BACKGROUND OF THE PRESENT INVENTION

A non-negative pressure or superimposing pressure water supply device refers to a water supply device directly connected in series with a water supply pipe network. Briefly, a cabinet-type non-negative pressure water supply device is arranged between a water inlet manifold and a water outlet manifold; the non-negative pressure water supply device is further connected in parallel with a water tank, which is characterized in that water storage is increased.

At the early stage, Chinese Patent No. CN2437746 discloses a pressurized water supply device which is equipped with an opening or closed seal valve on a water storage vessel. Chinese Patent No. CN2438751 discloses a pressurized steady flow water supply device in which “a float bowl, a float ball or stainless steel ball is used for controlling switches of an inlet and an outlet of a vacuum inhibitor.

Chinese Standard No. CJ/T254-2014 proposed a “limited pressure”. The limited pressure is a minimum pressure at an inlet of a water supply device, namely, a minimum pressure of the water inlet pipe network, for the purpose that the pressure of the water inlet pipe network is further guaranteed.

In the prior art, with the wide use of an suction and exhaust valve or a vacuum destroyer in a municipal pipe network and a water consumption system, and damage of vacuum on the water supply pipe network has been controlled. The water supply device should be developed towards directions of improving a water supply safeguard rate of the water consumption system and adapting to a pressure and water volume provided by the water supply pipe network.

Since the cabinet-type non-negative pressure water supply device has a large water storage volume, it can still adapt to operation conditions of a municipal pipe network when the water supply of the water consumption system is guaranteed. However, since water in the water tank is in an atmospheric pressure state, and therefore has a large pressure difference with a water inlet pressure; and storage time of water in the water tank has randomness due to water consumption so that the control of the device is excessively complicate, and parts of non-negative pressure container are lost neither.

SUMMARY OF PRESENT INVENTION

The disclosure is an improvement on a cabinet-type non-negative pressure water supply technology, and aims to provide a water supply system which has the same effect as that of a cabinet-type non-negative pressure water supply device, but in which facilities among water inflow, water storage and water supply are simple to link and continuous in operation parameters.

In order to achieve the objective of the disclosure, the adopted technical solutions are as follows: a water supply system for delivering water from a water inlet manifold to a water outlet manifold includes a first water inlet pipe, an air pressure water tank and a first water pump; the first water inlet pipe is connected to the water inlet manifold; the air pressure water tank is connected between the first water inlet pipe and a water suction pipe of the first water pump; a water outlet pipe of the first water pump is connected to the water outlet manifold; the air pressure water tank is provided with a preset first water level; and the amount of gas compressed in the air pressure water tank allows the pressure inside the air pressure water tank to be an atmospheric pressure when water in the air pressure water tank is in the first water level.

The pressure of the air pressure water tank is the atmospheric pressure when the water in the air pressure water tank is at the first water level, so the first water level is determined by the amount of gas compressed in the air pressure water tank, and the first water level is preset by controlling the amount of gas.

The first water inlet pipe is further provided with an intake valve.

The amount of gas can be an amount of air sucked by the intake valve arranged on the first water inlet pipe, and may further be an amount of other clean gases, such as filtered air or nitrogen. Controlling the amount of gas may be realized by communicating with the atmosphere at the first water level, for example, by arranging a suction and exhaust valve at the first water level. The controlling of the amount of gas does not exclude use of other detection and control methods, such as an electric device.

The intake valve is arranged at a relatively low point of a static pressure of the first water inlet pipe, and can be repeatedly arranged.

Preferably, a throttle pipe or a throttle plate is arranged between the intake valve and the air pressure water tank.

By adopting the existing technologies, the intake valve can further be the suction and exhaust valve, but other facilities that can permit entrance of gas when atmospheric pressure is reached are not excluded, such as a vacuum destroyer.

Preferably, the water supply system further includes a second water inlet pipe, one end of the second water inlet pipe is connected to the water inlet manifold, and the other end is connected to the water suction pipe of the first water pump; the second water inlet pipe is equivalent to span the air pressure water tank; and the air pressure water tank is further connected to the water outlet pipe of the first water pump.

Preferably, the water supply system further includes a second water pump, a water suction pipe of the second water pump is connected to the air pressure water tank, and the water outlet pipe of the second water pump is connected to the water suction pipe of the first water pump.

Preferably, the water outlet pipe of the first water pump is connected with a first pipeline, and the water suction pipe of the second water pump is connected with a third pipeline; a second pipeline is connected between the water suction pipe of the first water pump and the water outlet pipe of the second water pump; the first, second and third pipelines are respectively connected among each other; the air pressure water tank can be connected to the first or second or third pipeline; and the second water inlet pipe is connected to the third pipeline.

Preferably, the first pipeline is provided with a first valve, the second pipeline is provided with a second valve, and the third pipeline is provided with a third valve; and the first, second and third valves are opened when communicated with the air pressure water tank.

Preferably, the first water pump and the second water pump adopt a frequency converting control manner; when the air pressure water tank is communicated with the first pipeline or the third pipeline, the first water pump is controlled in a way of keeping a pressure on the water outlet pipe of the first water pump constant, and the second water pump is controlled in a way of keeping a pressure on the water outlet pipe of the second water pump constant; the second water pump operates in a frequency of no less than a preset frequency, and when the pressure of the water outlet pipe of the second water pump is higher than a certain preset value, the second water pump stops operating.

Preferably, each of the first water pump or the second water pump can be one water pump, and can also be a group of water pumps connected in parallel or in series. Further, the water suction pipe of the second water pump is connected to the water outlet pipe of the first water pump.

Preferably, the water supply system can further include a third water pump which is connected in parallel with the water suction pipe of the second water pump.

By such analogy, the third water pump can further be connected in parallel with the water outlet pipe of the first water pump or the water outlet pipe of the second water pump. The third water pump is replicated on the basis of the second water pump.

The water storage of the air pressure water tank includes a sum of water stored by the air pressure water tank and the water inlet pipe behind the intake valve.

Preferably, the air pressure water tank is further provided with a second water level higher than the preset first water level, and the second water level corresponds to a limited pressure of the first water inlet pipe; the air pressure water tank stores water between the preset first water level and the second water level under a pressure, namely, the water storage corresponds to a certain pressure.

Preferably, the air pressure water tank is further provided with a maximum level higher than the second water level, and the maximum water level corresponds to a maximum pressure of the first water inlet pipe. The water storage between the maximum water level and the second water level is balance water between the first water inlet pipe and the water outlet manifold when the first water inlet pipe is still above the limited pressure but the pressure has been reduced. Its effect is that water inflow is reduced when the pressure of the first water inlet pipe or the municipal pipe network is decreased, facilitating the maintenance of the pressure of the water inlet pipe or the municipal pipe network.

Preferably, the air pressure water tank is further provided with a third water level; the third water level corresponds to a pressure of the water outlet pipe of the first water pump; the third water level is a feature of sufficiently utilizing the air pressure water tank in the disclosure; the air pressure water tank connected to the water suction pipe of the first water pump can further be connected to the water outlet pipe of the first water pump; the third water level is higher than the second water level, thereby increasing the total water storage of the air pressure water tank.

Preferably, the air pressure water tank is further provided with a starting water level which corresponds to a minimum water supply pressure of the water outlet manifold and is a pressure for starting the first water pump. The air pressure water tank is connected to the water outlet of the first water pump, which is equivalent to a fact that the air pressure water tank in a frequency converting water supply device functions as the pressure-stabilizing vessel of the first water pump; the regulating water volume of the air pressure water tank is the volume of water between the third water level and the starting water level; the total water storage of the air pressure water tank is the volume of water between the third water level and the first water level, including the volume of water between the second water level and the first water level and the volume of water between the third water level and the second water level. If the water pressure of the first water inlet pipe meets the requirement of the minimum water supply pressure of the water outlet manifold, the maximum water level in the air pressure water tank is higher than the starting water level, at this moment, a direct supply manner can be adopted; if the maximum water level is lower than the starting water level, the first water inlet pipe is closed, and the water suction pipe of the first water pump is communicated with the second water inlet pipe.

The water storage of the air pressure water tank includes the volume of water between the starting water level and the first water level. The air pressure water tank can promote sufficient utilization of a water inlet pressure in the direct supply system when the air pressure functions as the pressure-stabilizing vessel of the first water pump, and can further solve the problem that a pressure of a direct supply zone in a building is insufficient, but adverse effect on the water inlet manifold is not generated.

When water between the maximum water level and the first water level is used, the air pressure water tank is communicated with the water suction pipe of the first water pump. When water between the third water level and the starting water level is used, the air pressure water tank is communicated with the water outlet pipe of the first water pump. The water pressure of the first water inlet pipe reflects flow change in the water inlet manifold, namely, change in water consumption; if the water pressure of the first water inlet pipe is relatively high, the volume of water inflow is guaranteed, the air pressure water tank is connected to the water outlet pipe of the first water pump, and thus the volume of the pressure-stabilizing vessel of the first water pump is increased, operation parameters of the pressure-stabilizing vessel or the starting frequency of the first water pump can be improved, more water storage is present in the process of reducing the water pressure of the first water inlet pipe, and the first water level can be used when the air pressure water tank is connected to the water suction pipe of the first water pump. A manner that such an air pressure water tank, at different periods of time, is respectively connected to the water suction pipe or the water outlet pipe of the first water pump can be more widely applied due to improvement of the water storage effect of the air pressure water tank.

Preferably, the air pressure water tank is further provided with a minimum water level lower than the first water level. The air pressure water tank is communicated with atmosphere when water in the air pressure water tank is between the first water level and the minimum water level, and is at atmospheric pressure.

The total water storage in the air pressure water tank includes the volume of water between the maximum water level and the second water level, a corresponding pressure in the air pressure water tank is higher than atmospheric pressure, and the water pressure of the first water inlet pipe is larger than the limited pressure; the total water storage in the air pressure water tank further includes the volume of water between the second water level and the first water level, a corresponding pressure in the air pressure water tank is also higher than atmospheric pressure, and the water pressure of the first water inlet pipe is less than the limited pressure; the total water storage in the air pressure water tank further includes the volume of water between the first water level and the minimum water level, a corresponding pressure in the air pressure water tank is atmospheric pressure, and the water inlet pipe has been closed. The volume of water stored between the minimum water level and the first water level is equivalent to water storage in a water tank in the cabinet-type non-negative pressure water supply device.

In the air pressure water tank, the water storage between the second water level and the first level is the water storage of the first water inlet pipe under the limited pressure, is at a pressure state and has the advantage of closing, and continuousness of effluent pressure is further maintained. The total water supply volume of the air pressure water tank in the first water inlet pipe under the limited pressure includes the water storage between the second water level and the first water level and the water storage between the first water level and the minimum water level, and can continuously meet the demand of the water outlet manifold.

If the minimum water level is provided in the air pressure water tank of the disclosure, the air pressure water tank needs to adopt a measure of destroying vacuum or intake air at the first water level; when the water storage between the first water level and the minimum water level is supplemented, the air pressure water tank further needs to adopt a venting measure. The measure of destroying the vacuum or air inflow adopted by the air pressure water tank can be performed above or below the first water level. The venting measure of the air pressure water tank corresponds to the first water level, and an automatic control measure can further be adopted, such as the opening or closing of a vent valve is controlled by using a signal.

Meanwhile, the first water inlet pipe is properly connected to the first water level. The first water inlet pipe has a gas supplementation effect when destroying the vacuum, but is opposite to a water inlet direction when in venting.

Preferably, the water outlet of the air pressure tank is provided with a vortex-preventing device; the vortex-preventing device is a horizontally arranged round baffle for allowing the velocity of water stream passing through the round baffle to be lower than that of water stream at a water suction hole.

The vortex-preventing device is a cyclone preventer.

The water supply system of the disclosure contains an air pressure water tank with a minimum water level. The generated effects are as follows: the air pressure water tank contains not only atmospheric-pressure water storage but also non-atmospheric pressure water storage. The atmospheric-pressure water storage is at a closed state at ordinary times or when not in use, so as to guarantee sanitation and safety. Especially, a thought that non-atmospheric pressure water storage and atmospheric-pressure water storage are combined together and further generates an effect that the water storage is consistent with its use pressure.

The effects of connecting the air pressure water tank to the water outlet of the first water pump are that first, the pressure is maintained, so that the water pump stops when in spare time or flow is excessively small; second, when the water volume of the water outlet manifold significantly changes, the significantly changed flow can be supplemented or balanced, so as to stabilize the operation state of the first water pump. The significant change of the flow is characterized in that when the flow is large, relative amplitude is small, and influence is small; when the flow is small, relative amplitude is large, and influence is large. When the water pressure of the first water inlet pipe is small, the water level in the air pressure water tank is low, the air pressure water tank is connected to the water suction pipe of the water pump to continuously use the water stored in the air pressure water tank; when the water pressure of the first water inlet pipe is large, the water level in the air pressure water tank is high, indicating the water inlet manifold or the water outlet manifold is in water consumption period of time when resistance is small and flow is small, and the air pressure water tank can further be connected to the water outlet pipe of the water pump.

There are two connection manners between the air pressure water tank and the first water pump in the disclosure: the first valve is opened, water in the air pressure water tank operates between the third water level and the starting water level, if the water pressure of the first water inlet pipe meets the demand of the water outlet manifold, this manner is a direct supply manner; if the water pressure of the first water inlet pipe does not meet the demand of the water outlet manifold, the water suction pipe of the first water pump is connected to the second water inlet pipe, which becomes a frequency converting water supply device including the first water pump and the pressure stabilizing vessel thereof or a non-negative pressure water supply device without adjustment device, and has the beneficial effects that the air pressure water tank has more water storage in the third water level; or the third valve is opened, water in the air pressure water tank operates between the maximum water level and the second water level, which is a cabinet-type non-negative pressure water supply device adopting the air pressure water tank and has beneficial effects that when water storage between the maximum water level and the second water level is used, and when the water pressure of the water inlet manifold is reduced to a limited pressure to use the water storage between the second water level and the first water level, a water storage vessel is maintained to be at a closed state to ensure the sanitation and safety of used water. By adopting the water supply system, since there are volumes of water hermetically stored and used between the third water level and the second water level and between the second water level and the first water level as well as the volume of water hermetically stored and used at atmospheric pressure between the first water level and the minimum water level, and thus the safeguard rate of the used water is improved, the sufficient utilization of water inlet pressure can be promoted in the direct supply system, and the energy-saving effect can be improved. When the first water pump is further connected with the second water pump, a second pipeline is used, and the air pressure water tank is connected to the second pipeline; since the second water pump pressurizes the second water inlet pipe, the pressure of the air pressure water pump is raised, in such a way, the water storage in the air pressure water tank is improved for the purpose that more water volumes are stored in the stagnant period of water so as to reduce volume of water inflow in the peak period of water, which can take a peak staggering and valley balancing effect. When the second water inlet pipe is connected to the second pipeline, the second water pump stops operating.

The disclosure holds the advantages of closed type water storage of a non-negative pressure technology. The air pressure water tank of the disclosure further has the advantage of continuous closing in the process of using water. The disclosure utilizes the existing vacuum destroying technology whose first feature is as follows: a gas sucked by destroying vacuum is stored and compressed; the quantity of the stored gas meets a fact that used water reaches a degree of destroying vacuum. This gas is compressed to form the air pressure water tank, which is equivalent to that this gas is stored in the air pressure tank to sufficiently utilize the gas.

The effective capacity of the air pressure water tank is the space above the minimum water level. According to the technical features of the disclosure, the pressure of the air pressure water tank in the first water level is an atmospheric pressure, and the gas quantity is equal to air quantity sucked by the intake valve and can further be generated by other vacuum destroying technologies or is preset by an automatic control manner. Between the first water level and the minimum water level, the air pressure water tank is communicated with the atmosphere and is at an atmospheric pressure state, the water is stored or used at an atmospheric pressure. When the air pressure tank undergoes water inflow, due to the limitation of the water pressure of the first water inlet pipe, the water level in the air pressure tank is between the first water level and the maximum water level. The volume of water taken below the limited pressure is the water storage between the second water level and the first water level. If the volume of taken water is less than the water storage between the second water level and the first water level, and the air pressure water tank is maintained at a closed state; if the volume of taken water is larger than the water storage between the second water level and the first water level, air is sucked via the intake valve suction so that the pressure in the air pressure water tank is maintained at the atmospheric pressure.

Since the volume of taken water has randomness, the air quantity destroying vacuum just can meet change in the volume of taken water, the disclosure recommends the gas sucked by destroying vacuum is stored and compressed. Air sucked by destroying vacuum is a gas that has entered the water supply system; it should consider a sanitation situation when a vacuum destroying measure is taken. However, adoption of other methods is not excluded. If other clean gases are adopted, the clean gases can be delivered to the intake valve or the air pressure water tank.

When the first water inlet pipe is protected not to generate a negative pressure, the pressure of the air pressure water tank is continuously reduced to atmospheric pressure. When the pressure of the water inlet pipe is protected not to be lower than the limited pressure, the water inlet pipe should be provided with one throttling gear, the water pressure is maintained above the limited pressure in front of the throttling gear, and after the throttling gear, since water hermetically stored in the air pressure water tank needs to be taken to ensure the water volume of the water outlet manifold, the pressure of the system can be reduced, when the pressure is reduced to generate a negative pressure, the intake valve destroying vacuum can undergo air suction.

When the water inlet pipe is protected not to be lower than the limited pressure, the first water outlet manifold adopts a throttling measure between the intake valve and the air pressure water tank, facilitating stabilizing the state of the intake valve.

The air pressure water tank has the advantage that the water volume corresponding to the compressed gas allows the system to have a stable process when the pressure changes; its adverse effect is that the compressed gas accounts for one part of capacity of the air pressure water tank. According to a Bo-Ma principle, a ratio of the volume of water stored by using the method of the disclosure accounting for total capacity of the air pressure water tank can be calculated. If the limited pressure is 0.1 MPa, the water storage accounts for 50%; if the limited pressure is 0.2 MPa, the water storage accounts for 67%. Compared with the traditional air pressure water tank, the water storage efficiency of the air pressure water tank of the disclosure has been improved. The capacity except the ratio is occupied by the gas, and this capacity can further be further reduced.

The second feature of the disclosure is as follows: the water storage of the water tank equivalent to the cabinet-type non-negative pressure water supply device is combined together with the non-atmospheric pressure water storage generated by compressing the gas destroying vacuum. Equivalent to the first feature, a capacity is increased in the air pressure water tank to store water taken at a atmospheric pressure. In such a way, water storages are centralized, so that not only the problem of water storage time in the air pressure water tank is readily solved but further the atmospheric-pressure water volume turns to be hermetically stored so as to ensure sanitation and reduce a control link in the device operation process; however, the pressure of the centralized water volume is continuously changed in the process of operation, which is more beneficial to stabile operation of the device, thereby generating a series of beneficial effects.

In the non-atmospheric pressure water storage manner, the air pressure water tank of the disclosure contains water taken at a atmospheric pressure, and thus the pressure of the first water inlet pipe can be utilized, and an energy-saving significance is generated; in the non-atmospheric pressure water storage manner, water taken at a atmospheric pressure is included, which has the advantages that first, compressed air quantity is reduced and water storage capacity is improved; second, water storage at a atmospheric pressure has a sanitation significance, and water storage in the non-atmospheric pressure water storage manner and water storage at air pressure are combined together so as to eliminate a concern about the period of water.

Compared with the prior art, the first water inlet pipe and the air pressure water tank which are used for storing water volume in the disclosure are equivalent to changing the shape of a steady flow tank or a supplementation tank. The generated effects are as follows: first, when the potential difference of the air pressure water tank relative to the high spot of the first water inlet pipe is relatively small, the influence of “non-negative pressure” of the air pressure water tank on the negative pressure generated by the high spot of the first water inlet pipe is eliminated, instead, the water storage of the first water inlet pipe is increased, and therefore defects are turned into advantages; second, this system extends application of a concept that a barometric effect renders water connected by an interface to generate an air pressure tank having a corresponding pressure, namely, the compressed gas maintains the process that the pressure of the water storage is continuously reduced, total gas volume maintains that one part of water storage is taken to be extended not to generate a negative pressure. Particularly, when the water inlet pipe is maintained to have no negative pressure or maintains the limited pressure, the pressure of the gas effectively acts on one part of water storage, while the total gas quantity maintains the pressures of other parts of water storage volume to be continuously reduced until the negative pressure is generated, at this moment, the intake valve destroying vacuum starts air suction.

The existing technology performs wide studies on a gas eddy phenomenon at a water outlet under a atmospheric pressure state. In the water tank (or water pool), a practical vortex preventing plate or a vortex preventing device is used for reducing the height difference between the water outlet and the minimum water surface to increase effective water depth, which is not applied in a non-negative pressure water supply device yet. Especially, one of features of the non-negative pressure water supply device is that the air pressure water tank is connected with the water pump, mingling of gases in water generates cavitation damage on the water pump. Thus, according to a phenomenon reflected by Article 3.4.13 from GB50015-2003 (2009 edition), the disclosure proposes a measure that a vortex preventing facility is added in the air pressure water tank in which the gas directly contacts with the interface of water. Since the air pressure water tank is connected with the water pump, the vortex preventing device can be used for eliminating the influence of vortex generated by this air pressure water tank on the water pump.

Corresponding to this air pressure water tank, the pressure in the air pressure water tank is continuously changed, which is beneficial to operation of the water pump. However, overpressure change amplitude can reduce the operation efficiency of the water pump due to an overlarge speed regulation ratio range. For this, a series booster pump further has an energy-saving significance.

The difficulty brought by adopting the series booster pump is how to adopt effective control.

The third feature of the disclosure is as follows: when the air pressure water tank is connected with the first pipeline or the third pipeline of the booster pump, the first water pump is controlled in a way of keeping a pressure on the water outlet pipe of the first water pump constant, and the second water pump is controlled in a way of keeping a pressure on the water outlet pipe of the second water pump constant. Further, the second water pump can operate in a frequency of no less than a set frequency; when the pressure of the water outlet pipe of the second water pump is higher than a certain set value, the second water pump stops operating.

Equivalent to the second water pump, the pressure of the water suction pipe of the first water pump is ensured; when the pressure of the water outlet pipe of the second water pump is higher than a certain set value, it is indicated that the pressurizing lift of the first water pump is too small, and the speed regulation ratio allows the first water pump to operate at low efficiency.

The fourth feature of the disclosure is as follows: when the air pressure water pump is connected with the second pipeline of the booster pump, the first water pump is still controlled based on the pressure of the water outlet pipe, the second water pump is controlled by setting a frequency conversion range having a certain width according to the pressure of the water outlet pipe of the second water pump and then combining the pressure of the water suction pipe of the second water pump. If the pressure of the water suction pipe of the second water pump is low, low frequency is selected within the frequency conversion range having a certain width, and if the pressure is high, high frequency is selected to operate.

According to the characteristic curve of the water pump, the second water pump operates according to the pressure of balanced air pressure water tank, and operates in a manner that if the pressure of the second water outlet manifold is high, the flow of the second water pump is large, and if the pressure is low, the flow of the second water pump is small.

Description of the fourth feature is a control method of a water pump. A frequency conversion range is set according to a first parameter point, and a specific converted frequency is determined according to a second parameter point; the frequency conversion range is based on the characteristic curve of the water pump to be used to coordinate flow and lift.

In summary, the disclosure provides an air pressure water tank whose first water level corresponds to the atmospheric pressure. One end of this air pressure water tank is connected to the first water inlet pipe to generate a second water level and a maximum water level, and the other end is connected to the water suction pipe of the first water pump; a minimum water level is further set in the total capacity of the air pressure water tank. This air pressure water tank is further connected to the water outlet pipe of the first water pump to generate the third water level and the starting water level; the water suction pipe of the first water pump is connected with the water outlet pipe of the second water pump, improving the lift of the water pump so as to correspond to an operation efficiency from the maximum water level to the first water level. The above any feature all can be independently adopted, and are all included within the protection scope of the disclosure.

In the prior art, Article 5.0.6 of CECS211-2012 stipulates the water capacity of the steady flow tank is no less than 1 minute to design flow, this capacity is equal to that in Article 5.4.3.1 of CJ/T254-2014 and less than the capacity (3 minutes) of water suction well of the water pump in Article 3.7.4 of the GB50015-2003 (2009 edition). Because a vacuum inhibitor is opened, this moment is a water using peak, the water pump operates at a designed flow, and the probability that these factors are supplemented each other is high, it is especially necessary that a vortex preventing measure is adopted in the air pressure water tank.

Article 5.0.6 of CECS211-2012 stipulates that the capacity of the non-negative pressure low-water-level water tank should be a maximum hour capacity of 1 hour-2 hours, and is close to a water regulation amount or an effective capacity (20% of daily water volume approximates a maximum hour capacity of 2 hours) stipulated in Article 3.7.2 or 3.7.3 of GB50015-2003 (2009 edition)

The applicant of the disclosure track multiple cases that water tanks are used at areas where application of non-negative pressure water supply device is good, and finds that safe water storage volume is overlarge, which may be associated with such a phenomenon that Article 5.1.13 of GB50974-2014 requires that Article 3.8.6 of GB50015-2003 (2009 edition) is not emphasized, wherein, one typical case is that there are no any measures that the water tank at the outlet of the side wall to be adopted.

Cautiously, change in water level in the existing water tank is continuously recorded by adopting a magnetic turnover water level meter.

DESCRIPTION OF THE DRAWINGS

In order to make the technical solutions in the disclosure or in the prior art described more clearly, the drawings associated to the description of the embodiments or the prior art will be illustrated concisely hereinafter. Obviously, the drawings described below are only some embodiments according to the disclosure. Numerous drawings therein will be apparent to one of ordinary skill in the art based on the drawings described in the disclosure without creative efforts.

FIG. 1 is a complete structural diagram of a water supply system according to embodiments of the disclosure;

FIG. 2 is a main structural diagram of a water supply system shown in FIG. 1.

FIG. 3 is a diagram showing water levels in an air pressure water tank according to embodiments of the disclosure;

FIG. 4 is a structural diagram of an air pressure water tank provided with a vortex-preventing facility;

FIG. 5, FIG. 6, and FIG. 7 are diagrams showing connections of pipelines between a first water pump, a second water pump and a third water pump according to the disclosure;

FIG. 8 and FIG. 9 are a diagram showing a connection structure of an intake valve and a vent valve according to embodiments of the disclosure.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

In order to make the objects, technical solution and advantages of the present disclosure more clear, the present disclosure will be further described in detail with reference to the accompanying drawings and embodiments below. It should be understood that embodiments described here are only for explaining the present disclosure and the disclosure, however, should not be constructed as limited to the embodiment as set forth herein.

FIG. 1 illustrates a water supply system for delivering water from a water inlet manifold 11 to a water outlet manifold 5, including a first water inlet pipe 2, an intake valve 1, an air pressure water tank 3, a first water pump 4, a second water inlet pipe 6, a second water pump 10, a first valve 7, a second valve 8, a third valve 9 and a pipeline 12 connecting the air pressure water tank 3.

The first water inlet pipe 2 and the second water inlet pipe 6 are connected with the water inlet manifold 11. The first water inlet pipe 2 and the second water inlet pipe 6 are each provided with a starting and closing valve. The high point of the pipeline of the water inlet manifold 11 or the first water inlet pipe 2 is provided with the intake valve 1. An intake valve 42 is further arranged in front of a backflow-preventing device 41, and this intake valve 42 allows the water inlet manifold 11 not to generate a negative pressure. The first water inlet pipe 2 is connected with the air pressure water tank 3, the air pressure water tank 3 is connected with the water suction pipe of the first water pump 4 through the second valve 8, and the water outlet pipe of the first water pump 4 is connected with the water outlet manifold 5.

The air pressure water tank 3 is provided with a preset first water level 101. In a certain volume of air pressure water tank 3, the preset first water level 101 determines compressed gas quantity which can be sucked by the intake valve 1 above the first water level 101 and discharged by the vent valve 14 below the first water level, and a pre-filling manner can further be adopted. Due to a limited pressure and a maximum pressure of the first water inlet pipe 2, this gas quantity determines a second water level 102 and a maximum water level 105. The water volume of the water outlet manifold 5 is random, and is different varying from seasons. The volume of water between the second water level 102 and the first water level 101 is at a barometric state and has the advantage of closing, and it is recommended that this water volume is determined by average daily water volume meeting the water outlet manifold 5. Preferably, the air pressure water tank 3 is further provided with a minimum water level 104, and the volume of water between the first water level 101 and the minimum water level 104 is determined by maximum daily water volume meeting the water outlet manifold 5.

At ordinary times, incoming water enters the air pressure water tank 3 through the water inlet manifold 11 and the first water inlet pipe 2, and water in the air pressure water tank 3 is pressurized by the first water valve 4 to be supplied to the water outlet manifold 5.

When the water pressure of the water inlet manifold 11 is reduced, it is indicated that the pipeline is connected with the water inlet manifold 11, or the traffic of the municipal pipe network is large, resistance is increased, which reflects that the water pressure of the water inlet manifold 11 is reduced, the pressure of the air pressure water tank 3 is correspondingly reduced, a gas in the air pressure water tank is expanded, the water storage is reduced, the reduced water storage is supplemented by water volume of the water outlet manifold 5, and its effects are to reduce water inlet volume, reduce the traffic of the municipal pipe network, decrease resistance and maintain water inlet pressure is maintained.

When the water pressure of the water inlet manifold is further reduced to a limited pressure, the water inlet manifold 11 stops water suction, at this moment, the water level in the air pressure water tank 3 corresponds to the second water level. The water storage in the air pressure water tank 3 from the second water level to the first water level is continuously supplemented with the water volume of the water outlet manifold 5, the pressure is continuously reduced with expansion of the gas in the air pressure water tank until the intake valve 1 arranged at the first water inlet pipe 2 performs air suction. If a minimum water level is further set in the air pressure water tank, the sucked air is supplemented to the air pressure tank 3, and the water storage in the air pressure water tank 3 from the first water level to the minimum water level is continuously supplemented with the water volume of the water outlet manifold 5, which is equivalent to the non-negative pressure water supply device being in a state of supply water by the water tank.

When the incoming water volume of the water inlet manifold 11 is reduced or the water pressure is decreased to the limited pressure, the second water inlet pipe 6 can be closed; when the water level in the air pressure water tank 3 is below the second water level, the third valve 9 can further be opened, in such a way, the air pressure water tank 3 is connected with not only the water suction pipe of the first water pump 4 but further the water suction pipe of the second water pump 10, and water supply lift can be increased at any time.

When the water pressure of the water inlet manifold 11 is relatively high, the incoming water volume is sufficient, and the air pressure water tank 3 corresponds to the maximum water level, the first water inlet pipe 2 can be closed, the second water inlet pipe 6 can be opened, the second water inlet pipe 6 is connected with the water suction pipe of the first water pump 4 through valves 45 and 44; the first valve 7 can further be opened, the second valve 8 is closed, and the air pressure water tank 3 is connected with the water outlet pipe of the first water pump 4, in such a way, the air pressure water tank 3 is used as a stabilizer of the first water pump 4, which is equivalent to a non-regulation device type non-negative pressure water supply device.

When the water pressure of the water inlet manifold 11 is higher than a pressure required by the water outlet manifold 5, the water inlet manifold 11 is connected with the water outlet manifold 5, for example, is communicated with the first water inlet pipe, and the first valve 7 is opened, which forms a direct supply system.

FIG. 2 is a structural diagram of a water supply system shown in FIG. 1, which is a basic water supply system form, including the first water inlet pipe 2, the air pressure water tank 3, the first water pump 4 and the water outlet manifold 5, reasonably, further including the intake valve 1 and an air pressure water tank 13.

The effects of the air pressure water tank 13 are that first, the pressure is maintained, so that the first water pump 4 stops when in spare times or when flow is too small; second, when the water volume of the water outlet manifold 5 significantly changes, the significantly changed flow can be supplemented or balanced, and the operation state of the first water pump is stabilized. According to demand of balancing the significantly changed flow, the air pressure water tank 3 is connected to the water outlet pipe of the first water pump.

FIG. 3 is a diagram of a water level in an air pressure water tank 3. The air pressure water tank 3 is provided with the first water level 101 and the second water level 102. Corresponding to the height of the first water level 101, the first water inlet pipe 2 is connected, and the vent valve 14 is further arranged. The air pressure water tank 3 is provided with a water outlet pipe 17. A minimum water level 104 is further set below the first water level 101; the third water level 103 is further set above the second water level 102. A maximum water level 105 and a starting water level 106 are further set between the second water level 102 and the third water level 103.

The first water level 101 corresponds to a atmospheric pressure, the second water level 102 corresponds to the limited pressure of the first water inlet pipe 2, the maximum water level 105 corresponds to a maximum pressure of the first water inlet pipe 2, the starting water level 106 corresponds to a minimum water supply pressure of the water outlet manifold, namely, a pressure for starting a booster pump; the third water level 103 corresponds to a pressure of the water outlet pipe of the first water pump. When the maximum water level 105 is higher than the starting water level 106, even the third water level 103, and a direct supply manner can be adopted to supply water.

It is recommended that the first water inlet pipe 2 is connected to the height of the first water level 101; the first water inlet pipe 2 can further be connected above or below the height of the first water level 101. If the first water inlet pipe 2 is connected above the maximum water level 105, when the actual water level is higher than the maximum water level 105, the first water inlet pipe 2 is at a closed state as described above, the air pressure water tank 3 is connected to the water outlet pipe of the first water pump; when the actual water level is lower than maximum water level 105, the first water inlet pipe 2 is connected with the gas in the air pressure water tank 3. After being approved by a water supply department, the backflow preventing device arranged on the water inlet manifold 11 can be canceled to reduce the resistance of the pipeline and sufficiently utilize an intake pressure.

A vent valve 15 can further be repeatedly arranged above the height of the vent valve 14; a vent valve 16 can further be repeatedly arranged below the height of the vent valve 14. The purpose of repeatedly arranging the vent valve 15 and the vent valve 16 is to regulate the quantity of the gas compressed in the air pressure water tank, namely, the height of the first water level 101 is regulated, for example, the valve of the vent valve 15 is opened, which is equivalent to reducing the compressed air quantity; the valve of the vent valve 16 is opened, which is equivalent to increasing the compressed air quantity. The first water level is set at the height of the vent valve 15 or the vent valve 16, the heights of the second water level and the third water level correspondingly vary with corresponding water storage volume, but corresponding pressures are unchanged.

The compressed gas quantity is reduced, which is equivalent to increasing the water storage of the water tank equivalent to the cabinet-type non-negative pressure water supply device; the compressed gas quantity is increased, which is equivalent to reducing the water storage of the water tank equivalent to the cabinet-type non-negative pressure water supply device. In such a way, the water storage in the air pressure water tank of the disclosure can further be regulated relative to the defined capacity.

The vent valve 14, the vent valve 15 and the vent valve 16 can be any proper vent valves in the prior art, and can further be a suction and exhaust valve.

FIG. 4 illustrates an air pressure water tank. A vortex preventing facility 18 is arranged in the air pressure water tank connected with the water outlet pipe 17.

FIG. 5 is a diagram of a pipeline of connecting a first water pump and a second water pump according to one embodiment of the disclosure. The water suction pipe 19 of the first water pump 4 is connected with a second water pump 10 in parallel, and a pipeline connected in parallel with the second water pump 10 is provided with a one-way valve 21 which is a span pipe of the second water pump 10; the second water pump 10 can further connected in parallel with the water outlet pipe 20 of the first water pump 4.

FIG. 6 is a diagram of a pipeline of connecting a first water pump with a second water pump according to another embodiment of the disclosure. A first pipeline 22 is connected with the water outlet pipe 20 of the first water pump 4, and the first pipeline 22 is provided with a first valve 7. A second pipeline 23 is connected with the water suction pipe of the first water pump 4 and the water outlet pipe of the second water pump 10, and the second pipeline 23 is provided with a second valve 8. A third pipeline 24 is connected with the water suction pipe 19 of the second water pump 10, and the third pipeline 24 is provided with a third valve 9. The first pipeline, 22, the second pipeline 23 and the third pipeline 24 are connected with the pipeline 12. The one-way valve 21 is arranged on the span pipe of the second water pump 10. The first pipeline 22 is further provided with a fourth valve 43, the second pipeline 23 is further provided with a fifth valve 44, the third pipeline 24 is further provided with a sixth valve 45, the fourth valve 43, the fifth valve 44 and the sixth valve 45 are respectively connected among each other 100.

FIG. 7 is a diagram of a first water pump connection pipeline according to yet another embodiment of the disclosure. The water suction pipe on the second water pump 10 can further be connected with a third water pump 27, and each segment of the connection pipeline can further be provided with the first pipeline 22, the second pipeline 23, the third pipeline and the pipeline 26 one by one.

Corresponding to FIG. 5 to FIG. 7, the second water pump 10 is connected to the water outlet pipe 20 of the first water pump 4, or the third water pump 27 is connected to the water outlet pipe 20 of the first water pump 4 or the effluent water of the second water pump 10, and the like, which can be done by a professional according to the above thought, and thus can not be illustrated one by one.

FIG. 8 is a diagram of a connection structure of an intake valve according to one embodiment of the disclosure. It can be seen that a capacity for storing water consisting of the first water inlet pipe 2 and the air pressure water tank 3 forms two system high spots, and can further form more than two system high spots. In a water stream direction, the intake valve 1 is arranged at a first system high spot; other system high spots form a capacity for storing and compressing gases. When the volume of water stored in the air pressure water tank is taken, air suction is performed from the intake valve 1; when stored water below the first water level is filled, venting is performed from the vent valve 14. The intake valve 1 is at high spot of the pipeline, the suction and exhaust valve can further be used to remove gases that are not generated when vacuum is destroyed; the vent valve 14 can further use the suction and exhaust valve to supplement intake quantity when stored water below the first water level is taken.

The system high spot is a low point relative to a static pressure, or a gas gathering position. The other system high spots can further be connected with the pipeline to balance the water surface height of the first water level.

The first water inlet pipe 2 forms a first system high spot, which is easily done.

FIG. 9 is a diagram of a connection structure of an intake valve according to another embodiment of the disclosure. Since the pressure of the air pressure water tank 3 corresponds to that of the first water inlet pipe 2, when the vent valve 14 discharge gases or the pressure of the compressed gases in the air pressure water tank 3 is increased, the first water inlet pipe 3 is at a water supplying state, and a water stream direction is opposite to a venting direction. However, when in a static state, when the first water inlet pipe 2 is connected to the gas gathering position in the air pressure water tank 3, and a gas inhibition measure should be taken. Alternatively, the intake valve 1 has no venting function, or a gas inhibition structure 28 is adopted outside the air pressure water tank, or a gas inhibition structure 29 is adopted inside the air pressure water tank.

As described above, the water supply system of the disclosure as well as connection of the air pressure water tank with the first water pump and the second water pump is a basic reflection of the thought of the disclosure, and any improvements disclosed by the water supply method are all included within the protection scope of the disclosure. 

We claim:
 1. A water supply system for delivering water from a water inlet manifold to a water outlet manifold, comprising a first water inlet pipe, an air pressure water tank and a first water pump; wherein, the first water inlet pipe is connected to the water inlet manifold; the air pressure water tank is connected between the first water inlet pipe and a water suction pipe of the first water pump; a water outlet pipe of the first water pump is connected to the water outlet manifold; the air pressure water tank is provided with a preset first water level; and the quantity of gas compressed in the air pressure water tank allows a pressure inside the air pressure water tank to be an atmospheric pressure when water in the air pressure water tank is in the first water level.
 2. The water supply system according to claim 1, further comprising a second water inlet pipe, wherein one end of the second water inlet pipe is connected to the water inlet manifold, and the other end is connected to the water suction pipe of the first water pump; and the air pressure water tank is further connected to the water outlet pipe of the first water pump.
 3. The water supply system according to claim 1, further comprising a second water pump, wherein a water suction pipe of the second water pump is connected to the air pressure water tank, and a water outlet pipe of the second water pump is connected to the water suction pipe of the first water pump.
 4. The water supply system according to claim 3, wherein, the water outlet pipe of the first water pump is connected with a first pipeline, and the water suction pipe of the second water pump is connected with a third pipeline; a second pipeline is connected between the water suction pipe of the first water pump and the water outlet pipe of the second water pump; the first, second and third pipelines are respectively connected among each other; the air pressure water tank is connected to the first, second or third pipeline.
 5. The water supply system according to claim 4, wherein, the second water inlet pipe is connected to the third pipeline.
 6. The water supply system according to claim 4, wherein, the first water pump and the second water pump adopt a frequency converting control manner; when the air pressure water tank is communicated with the first or third pipeline, the first water pump is controlled in a way of keeping a pressure on the water outlet pipe of the first water pump constant, and the second water pump is controlled in a way of keeping a pressure on the water outlet pipe of the second water pump constant; the second water pump operates in a frequency of no less than a preset frequency; and when the pressure of the water outlet pipe of the second water pump is higher than a certain preset value, the second water pump stops operating.
 7. The water supply system according to claim 1, wherein, the air pressure water tank is further provided with a second water level higher than the preset first water level, and the second water level corresponds to a limited pressure of the first water inlet pipe; the air pressure water tank stores water between the preset first water level and the second water level under a pressure.
 8. The water supply system according to claim 7, wherein, the air pressure water tank is further provided with a maximum level higher than the second water level, and the maximum water level corresponds to a maximum pressure of the first water inlet pipe.
 9. The water supply system according to claim 7, wherein, the air pressure water tank is further provided with a third water level; the third water level corresponds to a pressure of the water outlet pipe of the first water pump; the air pressure water tank is further provided with a starting water level which corresponds to a minimum water supply pressure of the water outlet manifold and is a pressure for starting the first water pump.
 10. The water supply system according to claim 7, wherein, the air pressure water tank is further provided with a minimum water level lower than the preset first water level, the air pressure water tank is communicated with an atmosphere when water in the air pressure water tank is between the first water level and the minimum water level, and is at atmospheric pressure.
 11. The water supply system according to claim 7, wherein, a water outlet of the air pressure tank is provided with a vortex-preventing device; and the vortex-preventing device is a horizontally arranged round baffle.
 12. The water supply system according to claim 11, wherein, the vortex-preventing device is a cyclone preventer.
 13. The water supply system according to claim 11, wherein, a throttle pipe or a throttle plate is arranged between an intake valve arranged on the water inlet manifold and the air pressure water tank. 